# Give a Bluetooth speaker a character

A repurposed speakerphone becomes a voice character with confirmed, persistent memories.

## Hardware
RDA5856ETE Bluetooth audio SoC / S10B-S_V4.0R6D board; Android phone

A repurposed speakerphone supplies the microphone and speaker for a character running through an Android app and private backend. The character asks before retaining memories.

## Shopping list

Parts for one build. Reuse equipment you already own. Quantities are planning quantities unless the creator explicitly specifies a count; kit contents are not additional purchases.

Quantities are for one build. Unless marked source-specified, they are planning quantities; confirm kit contents and the chosen configuration before ordering.

### Confirm before buying
- Retail speaker model, Bluetooth call-audio compatibility, Android requirements and private backend implementation are not disclosed. Do not buy a bare RDA5856 chip as a substitute.

### 1 × Bluetooth speakerphone with microphone
- Requirement: Required
- Quantity basis: Planning quantity for one build; check the selected configuration
- Purpose: Bidirectional call audio.
- Notes: Creator’s opened unit contains RDA5856ETE / S10B-S_V4.0R6D; this is an internal identifier, not a retail model.
- Sourcing: No exact purchase link verified; confirm the model and requirements above before ordering.
- Evidence: Creator source
- Source: https://youcanjustbuildthings.openai.chatgpt.site/projects/submission-2e8b5d907432e54a1615508b81e9638819eb074c14884294c2a2ebf13b8a75cc
- Source: https://x.com/i/status/2111287293931565363

### 1 × Android phone
- Requirement: Required
- Quantity basis: Planning quantity for one build; check the selected configuration
- Purpose: Run the custom app.
- Notes: Exact phone and supported Android version not specified.
- Sourcing: No exact purchase link verified; confirm the model and requirements above before ordering.
- Evidence: Creator source
- Source: https://youcanjustbuildthings.openai.chatgpt.site/projects/submission-2e8b5d907432e54a1615508b81e9638819eb074c14884294c2a2ebf13b8a75cc
- Source: https://x.com/i/status/2111287293931565363

### 1 × Speaker charging cable / power
- Requirement: Required
- Quantity basis: Planning quantity for one build; check the selected configuration
- Purpose: Power the speaker.
- Notes: Must match the actual speaker; connector unknown.
- Sourcing: Use existing equipment or match the specification above. No exact purchase link verified.
- Evidence: Setup requirement — check against your configuration
- Source: https://youcanjustbuildthings.openai.chatgpt.site/projects/submission-2e8b5d907432e54a1615508b81e9638819eb074c14884294c2a2ebf13b8a75cc
- Source: https://x.com/i/status/2111287293931565363

Source reviewed, not assembled or hands-on tested. A working product page does not confirm stock, firmware compatibility or a complete build.

## Setup
Computer companion

## Coding tool
Codex

## How the agent helped
The creator describes Codex as an engineering partner for the app and backend implementation. The documented work is not custom speaker firmware; firmware exploration remains future work.

## Before you build
Custom Android app and private backend, not custom speaker firmware. Physical microphone and speaker provide the interface; firmware exploration is future work.

## Sources
- Original build: https://youcanjustbuildthings.openai.chatgpt.site/projects/submission-2e8b5d907432e54a1615508b81e9638819eb074c14884294c2a2ebf13b8a75cc
- Supporting source: https://x.com/i/status/2111287293931565363

Source reviewed 2026-11-04. Not hands-on tested.